const cp = require('child_process')
const { resolve } = require('path')

;(async ()=> {
    const script = resolve(__dirname, '../crawler/trailer-list')
    const child = cp.fork(script, [])
    let invoked = false

    child.on('error', err => {
        if (invoked) return

        invoked = true
        console.log(err)
    })

    child.on('exit', code => {
        if (invoked) return

        invoked = false
        let err = code === 0 ? null : new Error('exit code' + code)

        console.log(err)
    })

    child.on('message', data => {
        let result = data.result

        console.log(result)
    })
    
})()